How Do You Identify Thundereggs?

Though thundereggs appear lke rocks, they can be easily identified by the abnormally round and bumpy brown-gray surface. Usually, thundereggs lie relatively close to the Earth's surface, embedded in the clay of the tuff, where they were formed.

How do you tell the difference between a thunder egg and a geode?

The main difference between geode and thunderegg is that geode is composed of crystals with a hollow inside, while thunderegg is solid. Thunderegg has defined rock and mineral composition. Thundereggs are chalcedony consolidation in rhyolites rocks, while geodes can contain various types of crystals.

What do thunder eggs look like on the outside?

With the appearance of an average looking rough rock on the outside, a careful slice and polish will reveal a hidden core of beautiful mineral deposits. Depending on the minerals present in the area, the inner core of thundereggs can vary significantly from region to region and site to site.